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中一數學方程
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1.The prices of a pack of potato chips and a bar of chocolates are ＄y and ＄17 respectively. Michael paid ＄44 for 3 packs of potato chips and a bar of chocolates . Set up an equation in y to describe.2.Amy bought 4 packs of biscuits in a shop . If she paid ＄100 and the change is ＄16,find the selling price of a... 顯示更多 1.The prices of a pack of potato chips and a bar of chocolates are ＄y and ＄17 respectively. Michael paid ＄44 for 3 packs of potato chips and a bar of chocolates . Set up an equation in y to describe. 2.Amy bought 4 packs of biscuits in a shop . If she paid ＄100 and the change is ＄16,find the selling price of a packs of biscuits . 3.A rectangle is 6 cm long.If the perimeter of the rectangle is 28 cm , find the width of the rectangle . 求快解,急用
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1. The price for 3 packs of potato chips = $3y The price for a bar of chocolates = $17 The amount to pay (in $): 3y + 17 = 44 ===== 2. Let $y be the selling price of a pack of biscuits. The amount to pay (in $) : 4y = 100 - 16 4y = 84 y = 21 The selling price of a pack of biscuits = $21 ===== 3. Let w cm be the width of the rectangle. The perimeter (in cm) : 2 x (6 + w) = 28 6 + w = 14 w = 8 The width of the rectangle = 8 cm 2013-08-09 13:40:35 補充： To solve the equation in Q.1 : 3y + 17 = 44 3y = 27 y = 9
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